Your double fertilizing the plant. The Scott's soil has nutrients in it and your giving it Jobe's plant food on top of that. Go to straight water for a couple weeks while the plant uses up the available nutrients in the soil.
Just a my $0.02 suggestion for next time, check into coco for next time-much easier than those heavier mediums, no bone dry cycle needed in the right containers and for me just seems easier than my old promix days.